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SSRN 2022年

作者： Guo, Xiangru Mao, Ningdong Sun, Chaoyang Wang, Chunhui Cui, Yinan Xiong, Zhiping Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China School of Mechanical Engineering University of Science and Technology Beijing Beijing100083 China Applied Mechanics Lab School of Aerospace Engineering Tsinghua University Beijing100084 China National Key Laboratory of Science and Technology on Materials under Shock and Impact Beijing Institute of Technology Beijing100081 China

The tension-compression asymmetry and orientation effect of dislocation-twin boundary (TB) interactions in twinned TWIP steels were investigated using the discrete dislocation dynamics simulations and Schmid's law. The different types of dislocations dominate the TB migration in the twinned TWIP steel during tension and compression with the same loading orientation, and the asymmetric dislocation reactions at TB were attributed to the different leading partials produced after the dissociation of dislocation under different loading modes (tension or compression). Moreover, the complex dislocation-TB interactions, such as dislocations traversing TB, cross slip, dissociation, pile up and so on, were determined by considering the orientation effect of dislocation activation and the asymmetry of dislocation dissociation. The research advances the understanding of asymmetric behavior of twin and its influence on the macro hardening in plastic deformation of TWIP steels. © 2022, The Authors. All rights reserved.

关键词： Dissociation

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A Novel Torsion Instrument for Miniaturized Components Based on the Flexural Pivot

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SSRN 2022年

作者： Liu, Dabiao Hu, Jianhui Liu, Hao Hu, Jiongjiong Luo, Tong Zhang, Zhiya Lei, Jian Hu, Peng Chen, Yanming He, Yuming School of Aerospace Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment Wuhan430074 China System Design Institute of Hubei Aerospace Technology Academy Wuhan430040 China Hubei Standardization and Quality Institution Wuhan430060 China

Torque measurement plays a significant role in characterizing microelectromechanical systems with rotation components and torsional behaviours of slender structures. A high-sensitivity torque transducer based on the flexural pivot with a wide measurement range is addressed. The torque transducer consists of a cylindrical flexural pivot acting as the elastic element, and an optical angle measurement system including dual laser displacement sensors. The instrument can measure the torque accurately using the flexural pivot with a known torsional spring constant. By selecting suitable pivots, it allows for a vast torque capacity ranging from 1.94×10 -4 to 1.91×10 -2 Nm, corresponding to a resolution ranging from 1.94×10 -9 to 1.91×10 -7 Nm. Torsion tests on Nylon 6 filaments, PET ribbons, and copper wires were performed with the instrument. The practicality and applicability of the method are confirmed. The developed instrument is a helpful tool for characterizing the mechanical properties of miniaturized components. © 2022, The Authors. All rights reserved.

关键词： Torsional stress

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Flexible Strain Sensors Fabricated by Fused Deposition Modeling-Based Multimaterial 3D Printing with Conductive Polyurethane Composites*

Flexible Strain Sensors Fabricated by Fused Deposition Model...

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International Conference on Mechatronics and Machine Vision in Practice (M2VIP)

作者： Xiaodan Yang Huilin Ren Chenchen Wu Yi Xiong Qi Ge Southern University of Science and Technology Shenzhen China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and Technology Shenzhen China

ISBN: (纸本)9781665431545

Flexible strain sensors have attracted much attention due to their excellent stretchability, conformability and ability to measure large deformations. These sensors have found a wide range of applications, including health tracking, human-machine interaction, and human motion monitoring. However, current mass-production methods do not support the small-batch customization of flexible strain sensors, and the additional mounting step reduces the structural integrity. This paper presents a widely accessible approach for the rapid fabrication of flexible strain sensors that are directly printed onto objects in an on-demand and reliable manner by exploring the multimaterial fused deposition modeling techniques and optimizing the composition of functional filaments. Furthermore, the feasibility and effectiveness of the proposed method are demonstrated in the development of customized, flexible strain sensors that have complex sensing patterns and geometries.

关键词： Geometry Solid modeling Tracking Three-dimensional printing Strain measurement Capacitive sensors Sensors

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Direct Wave Interference Suppression Method with Sparse-Sidelobe Constraint in Bistatic Sonar

Direct Wave Interference Suppression Method with Sparse-Side...

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2021 OES China Ocean Acoustics, COA 2021

作者： Nie, Donghu Su, Xin Li, Dongqi Wang, Yongce Zhang, Zenghui Liang, Jia Acoustic Science and Technology Laboratory Harbin Engineering University Harbin150001 China Key Laboratory of Marine Information Acquisition and Security Harbin Engineering University Ministry of Industry and InformationTechnology Harbin150001 China College of Underwater Acoustic Engineering Harbin Engineering University Harbin150001 China Beijing System Design Institute of Electro-Mechanic Engineering Beijing100854 China

ISBN: (纸本)9781728181905

In order to suppress the strong direct wave interference in the bistatic sonar system, this paper proposes a method that combines the weighted sparsity-constrained capon beamformer with the zero constraint. The algorithm uses the sparse distribution of beam response and adds sparse constraints (l1-norm constraints) in the side lobe. By using the orthogonal characteristics of the signal subspace and the noise subspace, a weighted matrix is constructed to weight the sparsity constraint. Subsequently, the optimal weight can be derived by minimizing the output power. In the bistatic sonar system, according to the prior knowledge of the system configuration, the direction of direct wave is often known. Based on the fact, the zero constraint is used to set the beam output response of the array form to be a null in a fixed direction. Under the constraint of null, a least-square method is exploited to approximate a constraint pattern to an ideal pattern in order to solve the optimal weight. Consequently, a deeper and wider null is generated, which improves the anti-steering vector angle mismatch of the array ability. In the case of small deviations in the direction of the interference wave, the receiver can also effectively suppress the interference. © 2021 IEEE.

关键词： Beamforming

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Study on the mechanism of microcrack propagation in bentonite under confining pressure conditions

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Quarterly Journal of Engineering Geology and Hydrogeology 2025年

作者： Guo, Jingna Liu, Jiangfeng Liu, Daoping Zhao, Yu Lei, Min Shi, Hao School of Applied Mathematics Chengdu University of Information Technology Sichuan Chengdu610225 China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and Technology Jiangsu Xuzhou221116 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chendu610213 China School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan232001 China

For underground nuclear disposal repositories, sealing performance is crucial to ensuring long-term operational safety. Bentonite, widely employed as a sealing material, effectively reduces leakage risks owing to its self-healing capacity. However, a comprehensive investigation of gas migration mechanisms in bentonite is imperative to elucidate the underlying leakage dynamics. This study not only offers theoretical insights for the safety assessment and design optimization of disposal repositories but also holds substantial practical significance in ensuring their secure performance. To accurately model gas migration in saturated bentonite, this study systematically investigates the effects of pore pressure on soil deformation and experimentally evaluates the impact of damage evolution on permeability and elastic modulus. Building on these experimental insights, we propose a coupled fluid-solid constitutive model. This model elucidates the progressive development of microcracks within bentonite under increasing gas pressure, providing a mechanistic understanding of fracture propagation in sealing systems. By integrating experimental data from bentonite hydration and gas breakthrough tests, the study verifies that gas migration under flexible boundary conditions is primarily governed by the dilatancy effect of bentonite. Furthermore, the model's validity and applicability are demonstrated. Subsequently, the model is employed to systematically investigate the influence of confining pressure on (1) the evolution of microcracks in bentonite, (2) permeability variations, and (3) gas breakthrough pressure thresholds. Based on these analyses, theoretical mitigation strategies to prevent gas breakthrough are established for specific confining pressure ranges. © 2025 The Author(s). Published by The Geological Society of London. All rights, including for text and data mining (TDM), artificial intelligence (AI) training, and similar technologies, are reserved. For permissions:

关键词： Microcracks

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Delamination of an Elastic Cuboid from a Flat Rigid Substrate

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SSRN 2023年

作者： Chen, ZiJian Sun, XiaoHao Zhu, YinBo He, ZeZhou Zhao, Yang Wang, Zhengzhi Wu, HengAn Wu, XiaoPing Gu, Ping CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei230027 China Department of Mechanical Engineering University of Colorado Boulder BoulderCO80309 United States Department of Precision Machinery & Precision Instrumentation University of Science and Technology of China Hefei230026 China Department of Engineering Mechanics School of Civil Engineering Wuhan University Hubei Wuhan430072 China

Due to their strong pull-off force on noncooperative objects, dry adhesive materials have promising applications in gecko-mimicking robots and mechanical grippers. Previous experimental studies have shown that uniform interfacial stress and center delamination are favorable for achieving a high pull-off force;however, an in-depth understanding of interfacial stress distribution, delamination mode, and pull-off force of square cross-section elastomers is lacking. The square cross-section is expected to improve the packing ratio and pull-off force further. This paper studies a model system where an elastic square cuboid is detached from a flat rigid substrate to provide theoretical support for the design of adhesive materials. Based on elastomers' energy release rate and instability, we establish a three-dimensional model for the elastic square cuboid and analyze the mechanism of three delamination modes: edge delamination, center delamination, and cavity delamination. Furthermore, a new theoretical model for the pull-off force and phase diagram of the various delamination modes is developed. We found three subdivision crack patterns in the cuboid edge delamination mode, arc-shaped, fingering, and rhombus, which are different from the cylinder sample. Fingering cracks of cylinder samples are usually considered characteristics of elastic instability, but those of cuboid samples cannot be defined as elastic instability. The three edge crack patterns are gradually transformed, determined by the interfacial stress distribution, which is affected by the sample width-to-thickness ratio. The following results are obtained by combining the experimental and theoretical pull-off forces and phase diagram data. First, the interfacial stress distribution determines the pull-off force, and the delamination mode is an index to judge the stress distribution. Second, we propose a novel dry adhesive design strategy that regulates interfacial delamination to achieve controllable pull-of

关键词： Adhesion

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Optimization of Clustering Strategy and Resource Allocation for Clustered Federated Learning

Optimization of Clustering Strategy and Resource Allocation ...

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GLOBECOM 2022 - 2022 IEEE Global Communications Conference

作者： Wenchao Xia Bo Xu Haitao Zhao Yongxu Zhu Xinghua Sun Tony Q.S. Quek Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Nanjing China Division of Computer Science and Informatics London South Bank University London U.K. School of Electronics and Communication Engineering Shenzhen Campus of Sun Yat-sen University Shenzhen China Inforrnation System Technology and Design Pillar Singapore University of Technology and Design Singapore Singapore

ISBN: (纸本)9781665435413

Federated learning (FL) framework enables user devices collaboratively train a global model based on their local datasets without privacy leak. However, the training performance of FL is degraded when the data distributions of different devices are incongruent. Fueled by this issue, we consider a clustered FL (CFL) method where the devices are divided into several clusters according to their data distributions and are trained simultaneously. Convergence analysis is conducted, which shows that the clustered model performance depends on cosine similarity, device number per cluster, and device participation probability. Then, aiming at optimizing the model training performance, a joint problem of resource allocation and device clustering is formulated, which is solved by decoupling it into two sub-problems. Specifically, a coalition formation algorithm is proposed for the device clustering sub-problem, and the sub-problem of bandwidth allocation and transmit power control is solved directly due to its convexity. Finally, simulation experiments are conducted on the MNIST dataset to validate the performance of the proposed algorithm in terms of test accuracy.

关键词： Performance evaluation Training Wireless communication Federated learning Power control Clustering algorithms Channel allocation

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Integration of Mixture of Experts and Multimodal Generative AI in Internet of Vehicles: A Survey

arXiv

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arXiv 2024年

作者： Xu, Minrui Niyato, Dusit Kang, Jiawen Xiong, Zehui Jamalipour, Abbas Fang, Yuguang Kim, Dong In Shen, Xuemin The School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore The School of Automation Guangdong University of Technology Key Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education Guangzhou510006 China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China The Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore The School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia Department of Computer Science City University of Hong Kong Kowloon Hong Kong The Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of The Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada

Generative AI (GAI) can enhance the cognitive, reasoning, and planning capabilities of intelligent modules in the Internet of Vehicles (IoV) by synthesizing augmented datasets, completing sensor data, and making sequential decisions. In addition, the mixture of experts (MoE) can enable the distributed and collaborative execution of AI models without performance degradation between connected vehicles. In this survey, we explore the integration of MoE and GAI to enable Artificial General Intelligence in IoV, which can enable the realization of full autonomy for IoV with minimal human supervision and applicability in a wide range of mobility scenarios, including environment monitoring, traffic management, and autonomous driving. In particular, we present the fundamentals of GAI, MoE, and their interplay applications in IoV. Furthermore, we discuss the potential integration of MoE and GAI in IoV, including distributed perception and monitoring, collaborative decision-making and planning, and generative modeling and simulation. Finally, we present several potential research directions for facilitating the integration. © 2024, CC BY.

关键词： Integration

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Tissue-like Mechanical Confinement Inhibits Multipolar CellDivision

Tissue-like Mechanical Confinement Inhibits Multipolar CellD...

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第十九次中国暨国际生物物理大会

作者： Longcan Cheng Jingchen Li Houbo Sun Hongyuan Jiang Hefei National Laboratory for physical Science at the Microscale CAS Key Laboratory of Mechanical Behavior and Design of MaterialsCAS Center for Excellence in Complex System MechanicsDepartment of Modern MechanicsUniversity of Science and Technology of China

Multipolar spindle is a common feature of many cancer cells,and recent experiments have shown that it is sensitive to mechanical constraints from extracellular microenvironment,which can either suppress or promote the appearance of multipolar ***,little is known about what is the difference between various forms of mechanical confinements,and how they affect multipolarity and chromosomesegregation fidelity.

关键词： Tissue-like Mechanical Confinement Inhibits Multipolar CellDivision

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Research on in-plane fluid-elastic instability of heat transfer tube in steam generator 48

Research on in-plane fluid-elastic instability of heat trans...

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48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID

作者： Qi, Huan-Huan Jiang, Nai-Bin Huang, Xuan Feng, Zhi-Peng Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China 328 Changshun Avenue Chengdu China

ISBN: (纸本)9788487985317

Due to a small gap between the anti-vibration bars (AVBs) and the heat transfer tubes, and according to the position of AVBs and the number of continuous failures of the in-plane support, the in-plane restraint failure analysis of AVB is divided into 13 cases. The influence of the restraint failure on the in-plane mode of the heat transfer tube under different cases is analysed. The mode damping ratio was calculated by performing a weighted average method based on the mode shape function, and then the effects of different restraints by AVBs on fluid-elastic instability of steam generator tubes are studied. The analysis results show that with the increase of the continuous failure position of the in-plane support, the first-order modal frequency in the elbow zone decreases continuously, and the mode shape appearing in the elbow zone becomes more obvious. The first-order mode in the elbow zone is not necessarily the mode in which the largest fluidelastic instability ratio occurs. The vibration mode with the largest ratio of the fluid-elastic instability appears almost in the elbow zone. With the increase of the continuous failure position of the in-plane support, the fluid-elastic instability ratio increases continuously. When three or more continuous AVBs fail in-plane, fluidelastic instability will occur. © INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved.

关键词： Tubes (components)

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